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  1. simonfr

    LO/TO - remote circuit breaker

    Are you suggesting that the cable will be left on potential from the wind turbine at all times? No, the cable will be earthed at all times until plugged in and power is demanded. However the operator(s) on the vessel doing the plugging in, althought the control system/safety system will ensure...
  2. simonfr

    LO/TO - remote circuit breaker

    I am working on a project whereby we shall be providing power from a windfarm to a vessel, so the vessel (if battery) can be charged, or no need to run engines for hotel load when stationary for the night. The electrical system will be on the wind turbine column (in UK/EU) waters. The vessel...
  3. simonfr

    Earth conductor sizing......

    Yes, i know, its been done millions of times before! So sorry in advance. So, im overthinking this so doubting myself. Opinions please..... Cable from X to Y - 5km long. Secondary Voltage 11kV (Primary is 66kV, Z=6%). Power 6MW. System is TN-C. The cable is 3 core and earth. Cable conductor...
  4. simonfr

    3 winding transformers - fluxing

    Thanks waross The main concern in the back of my mind and a throwaway comment given is that without the main winding operational, the tertiary may not function properly as the primary/secondary interaction is also required to help flux the primary/tertiary winding.
  5. simonfr

    3 winding transformers - fluxing

    Looking for some inf9ormation regarding 3 winding transformers and a question i have. Looking at a design which requires a 3 winding transformer. 66kV on primary, 11kV on Secondary and 415V on tertiary. The 66/11kV winding is 5MVA to power a specific bit of plant, however the 66kV/0.415...
  6. simonfr

    Neutral rated voltage - IEC 80005

    If the ship - and the shore power system - is an IT system. The 'shore' supply neutral point shall be earthed via high resistance. The vessel generation may be 3 phase + neutral, with the neutral bonded to the hull 'earth' via high resistance also. Connect both shore and ship cabling, to...
  7. simonfr

    Neutral rated voltage - IEC 80005

    Im trying to understand the text in IEC 80005 The standard considers that the standard rating cables are 6/10(12)kV. Fine all good But then the standard considers that the Neutral cables are considered to be 1.8/3(3.6)kV. Now, if we are using say 10kV, the corresponding neutral voltage for...
  8. simonfr

    What does this circuit do?

    It was the 6581 SID chip at fault. The volume part of the IC wasnt operational. Cheers for your help gents. Simon
  9. simonfr

    What does this circuit do?

    Guys, Please ignore the above post. I used the Toshiba datasheet to identify the pinouts. Either its wrong or i dont have the toshiba ones, but ive turned it around and replaced back into the circuit (another new one) and im back to where i started. Sound at a very low level. I have removed all...
  10. simonfr

    What does this circuit do?

    Gents! Drawing says 2SC1815, got some 2SC1815s off eBay. Now fitted matching up the base collector emitter, but now have no sound period. BUT, a 2SC1815 didn't come out. A C945 came out. Are these equivalent? Cheers Simon
  11. simonfr

    What does this circuit do?

    Yeah, the schematic seems to have disappeared. The transistor is a 25C1815 as marked on the drawing. Need to find one or an equivalent!! Cheers, Simonhttp://files.engineering.com/getfile.aspx?folder=68f22711-1008-48f0-8d9b-7ee5d797cd04&file=310378-1-left.gif
  12. simonfr

    What does this circuit do?

    Gents, Changed out C85, and it was a 10uF capacitor, and weirdly it didn't actually make an instant difference. But a few minutes later I now get 'perfect' sound but it's very faint. Need to ramp up the volume to the max on the monitor. Tested lead and monitor on other computer (commodore 16)...
  13. simonfr

    What does this circuit do?

    Thanks guys. Sorry I didn't notice the '+' on the circuit. I did think it was part of a 2 in the drawing. I have ordered 10uF capacitors off eBay. So was planning to put two of them in parallel to achieve 20uF. But it souls like C85 from what you guys describe. Will hopefully get it done at the...
  14. simonfr

    What does this circuit do?

    Doh. Please ignore the stupid post above. I meant to write, if I use a polarised capacitor, which way do I install it polarity wise?
  15. simonfr

    What does this circuit do?

    What would be the likely occurence if I removed C85 from the circuit?
  16. simonfr

    What does this circuit do?

    Thanks for your replies guys. Im not an Electronic Engineer myself, so did not know the purpose of many of the elements in this circuit, especially taken as a 'group'. I will see if i can blag an oscilloscope from someone to have greater depth and understanding if the preliminary...
  17. simonfr

    What does this circuit do?

    Ladies and Gents. I am looking for some help regarding the function of this circuit (attached). Its the output of the SID (sound chip) of a commodore 128 computer. The sound out of the monitor speakers is crackly and faded. I would like to test the output at points along the circuit if i can...
  18. simonfr

    Generator subtransient reactance measurement

    Wolf Thanks for replying. Its a Solar Centaur 40, 4MVA Gas Turbine Generator. The generator is a 'one off', and being manufactured by Kato Engineering. According to their test procedures document, they shall be testing for Subtransient Reactance amongst others. I do not have the test method...
  19. simonfr

    Generator subtransient reactance measurement

    We are getting a new generator, and the manufacturer shall be performing a variety of tests including Transient & Subtransient Reactance test. I do not have the test method references IEEE std. 115, Sec 11.8 or IEC 34-4, sec. 3 par 7&8. How do they physically test for these reactances and the...
  20. simonfr

    Fault Calculations - t=8ms (60Hz)

    We are using the ETAP computer modelling for our power system and are calculating the fault levels for the 600VAC busbars which are connected to the main GTG's My understanding is that the value always used to determine the fault level is the t – 8ms time, which for a 60Hz sytem is the half...

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